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1-Benzoyl-3-hydroxy-6(1H)-pyridazinones and use as plant growth regulators
| Details |
Inventors: Hoffmann, Otto L.; Patel, Natu R.;
Assignee: Gulf Oil Corporation (Pittsburgh, PA)
Primary Examiner: Berch; Mark L.
Assistant Examiner:
Attorney, Agent or Firm: Cline; Carl A.
A novel class of growth regulator compounds of the structural formula ##STR1## is disclosed, in which Y is --COOH or an agriculturally acceptable salt thereof, --COOR, --CH.sub.2 OH, --CHO, --R, --OR or halogen and R is C.sub.1 to C.sub.4 alkyl or alkenyl. |
|
DETAILED DESCRIPTION We claim: 1.
A compound having the structural formula ##STR5## in which Y is --COOH or an agriculturally acceptable salt thereof, --COOR, --CH.
sub.
2 OH, --CHO, or --OR, and R is C.
sub.
1 to C.
sub.
4 alkyl or alkenyl.
2.
A compound according to claim 1 in which Y is --COOCH.
sub.
3.
3.
A compound according to claim 1 in which Y is --COOC.
sub.
2 H.
sub.
5.
4.
A compound according to claim 1 in which Y is --COOH or an agriculturally acceptable salt thereof.
5.
A compound according to claim 1 in which Y is --COOCH.
sub.
2 CH.
sub.
2 CH.
sub.
3.
6.
A compound according to claim 1 in which Y is --OCH.
sub.
3.
Description:
DESCRIPTION OF THE INVENTION The use of 1,2-dihydro-3,6-pyridazinedione, commonly called maleic hydrazide, as a plant growth regulator and inhibitor is widespread and has been responsible for significant improvements in the production of certain specific agricultural crops.
Many derivatives of this active substance have also been known for some time, none of which has shown any substantial improvement or useful difference in growth regulating activity, in comparison with the parent compound.
It has been known, for example that the benzoyl derivative, 1-benzoyl-3-hydroxy-6(1H)-pyridazinone, having the structural formula ##STR2## has growth inhibiting activity approximately equal to maleic hydrazide, as measured by inhibition of bud growth on soybeans.
(Canadian J.
Biochem.
and Physiol.
v.
40 p.
1159-1165, Sept.
1962, also U.
S.
Pat.
No.
2,614,917.
) When applied to soybean plants which are in the process of setting pods, or on which pods are set, this compound causes the pods to shrink, turn brown and drop.
We have discovered a novel class of compounds that differs from the aforementioned compound only by the presence of a single substituent group, which possesses growth regulating activity of a distinctly different type, so that these compounds may be used, for example, to increase the setting and filling of pods on soybeans, as well as for other purposes, such as selective postemergent control of wild oats
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Vasodialators 
